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Pressure Drop Across Finned Cylinders Enclosed in a JacketThe pressure drop across finned cylinders in a jacket for a range of air speeds from approximately 13 to 230 miles per hour has been investigated. Tests were made to determine the effect on the pressure drop of changes in fin space, fin width, jacket entrance and exit areas, skirt-approach radius, and the use of fillets and a separator plate at the rear of the cylinder. The pressure drop across the cylinder increased as the fin space decreased, the increase being very rapid at fin spaces smaller than approximately 0.20 inch. Fin width had little effect on the pressure drop for the range of widths tested. The pressure drop across the cylinder was nearly halved by increasing the skirt-approach radius from 3/4 inch to 1-1/4 inches, but fillets and a separator plate at the rear of the cylinder had little effect on the pressure drop. The pressure drop across a cylinder with tapered fins was greater than that for a cylinder having rectangular fins with the same effective fin spacing.
Document ID
19930081410
Acquisition Source
Legacy CDMS
Document Type
Other
Authors
Rollin, Vern G
Ellerbrock, Herman H
Date Acquired
September 6, 2013
Publication Date
November 1, 1937
Report/Patent Number
NACA-TN-621
Accession Number
93R10700
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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